Angle-or,,,,,-Pull-of-Muscleexercise therapy.pptx

angle of pull of muscle with example of upper extrimity

1. Angle of pull of Muscle Dr. kavita Meena Department of Physiotherapy

2. Skeletal  muscles  are attached to bones on each end by tendons. The  origin :  is the fixed attachment The insertion : moves with contraction.

3. Definition Angle between muscle insertion and bone on which it inserts. Rotary component Nonrotary component

4. Introduction A force is most effective when it is applied at right angle. Muscle’s angle of pull changes with every degree of joint motion.

5. Mechanical Efficiency of a Muscle Mechanically the pull is most efficient when the muscle is inserted at right angles to the bone. Rotary Component : Force of a muscle contributing to bone's movement around a joint axis .

6. Angle of pull is Reduced… <90° This efficiency is decreased as the angle of pull is reduced, because some of the force is used in pulling the bone of insertion towards the joint representing the fulcrum.

7. Most resting muscles have an angle of pull < 90°. Helps to maintain stability of the joint. Closer the angle of pull is to 90° greater the Rotary component.

8. Angle of Pull….. 90° Th e approximation of the articular surfaces has a stabilizing effect upon the joint which is greatest when the direction of the pull of muscle is longitudinal.

9. Angle of pull is Increased… >90° The mechanical efficiency of the muscle pull is also reduced when the angle of insertion is increased from the right angle.

10. Angle of pull is Increased… >90° (Conti…) In this case the joint becomes less stable as the angle increases. Can not exert much force.

11. Efficiency of a resistance T he sustained pull of a force offering resistance will also be maximal when it is applied at right angle to a lever. I t will decrease as the angle of pull becomes acute / obtuse.

12. Resistance can be applied with the help of rope / therapist hand. R ight angle pull is employed in that part of the ange in which maximum resistance is required.

13. THANK YOU